SuperFish Aqua-Flow 50 Crystal Clear Aquarium Filter Cartridge (3pk)\nThe SuperFish Aqua-Flow 50 Crystal Clear Easy Click Filter Cartridge combines filter foam and Crystal Clear Media, a mix of activated carbon and zeolite. This special formulated SuperFish media removes colouration, organic compounds, and ammonia from the water whilst suppressing nitrate and phosphate accumulation. The result is crystal-clear, healthy water with reduced algae growth. Designed exclusively for the Aqua-Flow 50 Aquarium Filter the specially engineered SuperFish triple -action filter cartridges deliver effective mechanical, biological and chemical filtration. The innovative SuperFish Easy-Click quick-release system streamlines aquarium maintenance, letting you swap Aqua-Flow Crystal Clear Filter Cartridges in moments rather than minutes. Recommended for monthly replacement, this pack of 3 Filter Cartridges will maintain peak filter performance for 3 months, delivering optimal water clarity and chemical y